If you are standing in front of the truck with the hood up, it is in the back left corner to the right of the heater resistor.
Heater blower resistor is what controls the low medium high speeds...
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probably the blower motor resistor
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Location of 2007 heater blower Transistor resistor
Under the hood, on the passenger side of firewall, near the blower motor.
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In general the heater blower motor speed resistor is located in close proximity to the blower motor.